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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 7: (-2,5) . ( 6/7 + 5 ) + (-2,5) . ( 1 1/7 – 5 )

Tháng Mười 27, 2022 Toán học 2 Comments 0 views

Toán Lớp 7: (-2,5) . ( 6/7 + 5 ) + (-2,5) . ( 1 1/7 – 5 )

Comments ( 2 )

  1. thanhmaianh
    thanhmaianh
    27 Tháng Mười, 2022 at 8:28 sáng
    Reply
    (-2,5).(\frac{6}{7}+5)+(-2,5).(1\frac{1}{7}-5)
    =(-2,5).[(\frac{6}{7}+5)+(\frac{8}{7}-5)]
    =(-2,5).[\frac{6}{7}+5+\frac{8}{7}-5]
    =(-2,5).[(\frac{6}{7}+\frac{8}{7})+(5-5)]
    =(-2,5).(\frac{14}{7}+0)
    =(-2,5).2
    =-5
     

  2. hiennhi98
    hiennhi98
    27 Tháng Mười, 2022 at 8:28 sáng
    Reply
    Giải đáp:
    -2,5.(6/7+5)+(-2,5).(1 1/7 -5)
    =-2,5.(6/7+5)+(-2,5).(8/7-5)
    =-2,5.(6/7+5+8/7-5)
    =-2,5.[(6/7+8/7)+(5-5)]
    =-2,5.2
    =-5
     

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222-9+11+12:2*14+14 = ? ( )

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